Electronic ignition device for internal combustion engines

Claim 2

In an ignition distributor for internal combustion engines of the type having an open housing with a rotatable shaft therein, a rotatable distributor arm having a lower stem portion for mounting on the end of said shaft, a mechanical interrupter arranged on an adjustable disc support positioned below said distributor arm, said interrupter being controlled by cam means fixed to said shaft, a cap for said housing carrying a plurality of contacts in sequential communication with said arm, the improvement comprising: a magnetic pickup positioned in said distributor housing with or without the presence of said mechanical interrupter, said magnetic pickup including a rotatable disc of a nonmagnetic material positioned in free space above said interrupter support and secured to said distributor arm for synchronous rotation by said shaft, said rotatable disc being provided with a plurality of permanent magnets corresponding in number to the number of cylinders of the internal combustion engine, a stationary induction coil mounted below said rotatable disc on said interrupter support and having a soft iron core, said permanent magnets each having a pole face confronting an end face of said iron core during rotation of said disc, said permanent magnets of said disc and said induction coil together with said soft iron core being arranged with regard to said disc in such a manner that the pole faces of one magnetic pole of said permanent magnets move past the end face of the soft iron core.

Claim 3

The improvement of claim 1 further including pulse shaper means incorporating a transistor amplifier means and an input means for connecting said input with said induction coil, said connecting means including a diode and a resistor for connecting one end of the induction coil with the base of a transistor of said transistor amplifier means of said pulse shaper means in order to deliver to said transistor the half-waves of the signals produced at said induction coil during rotation of the disc when the magnetic field collapses, and an ignition circuit electrically connected with said pulse shaper means and electrically connected at the output side with said distributor arm of said ignition distributor and controlled by output pulses of said pulse shaper means.

Claim 4

An ignition device according to claim 2, in which said transistor amplifier means connected to said induction coil, is controlled on the input side by the one half-waves of the control signals produced upon rotation of the magnet armature, and in which a controllable rectifier having a limiting resistor is connected to the outputs of the transistor amplifier means, and an RC-member consisting of a capacitor and series connected resistor is connected to the junction point of the limiting resistor and rectifier, said controllable rectifier being switched through by a reference voltage member having a lower reference voltage than the operating voltage of the transistor amplifier and connected in parallel with said rectifier and with a control electrode, when the output voltage of the amplifier attains the reference voltage, in order to produce via the RC-member, for each of the one half-waves oF the control signal, a control pulse for said ignition circuit which is connected to the RC-member.

Claim 5

An ignition device according to claim 3, wherein said transistor of said transistor amplifier means comprises a n-p-n transistor in common-emitter circuit, said coil being wound in such manner as to produce half-waves with a negative amplitude upon a decaying magnetic field.

Claim 6

An ignition device according to claim 4, wherein said controllable rectifier is formed as a miniature thyristor having an anode connected by a limiting resistor to the collector of the n-p-n transistor, and a cathode connected to the emitter of said transistor.

Claim 7

An ignition device according to claim 5, wherein said reference voltage member comprises a Zener diode having an anode connected to the control electrode of said miniature thyristor and by a resistor to the emitter of the n-p-n transistor.

Claim 8

An ignition device according to claim 6, wherein said Zener diode is connected in parallel to the anode-control electrode gap, the Zener voltage of said diode not exceeding 70 percent of the operating voltage of the transistor.

Claim 9

An ignition device according to claim 6, wherein the collector of the n-p-n transistor is connected to an output terminal adapted for connection with an RPM counter by means of a matching circuit.

Claim 10

An electronic ignition device for an internal combustion engine having an ignition distributor and an ignition circuit electrically connected with the distributor arm of the ignition distributor on the output side, said ignition circuit being controlled without contacts by a magnetic pick-up having a rotatable armature and a stationary induction coil, wherein said armature of the magnetic pick-up comprises a disk of non-magnetic material mounted on said distributor arm for rotation therewith, a plurality of permanent magnets inserted in said disk, the number of magnets corresponding to the number of cylinders of the internal combustion engine, the magnets being uniformly spaced on the disk in circumferential direction and disposed at equal radial distances from the axis of rotation of said distributor arm, said magnets each having one of the pole faces exposed on the side of said disk remote of the distributor arm and situated in a plane at right angles to said axis of the distributor arm, and an induction coil having a soft iron core provided with an end face adjacent said side of the disk and arranged so that upon rotation of the disk said exposed pole faces move across said end face of the soft iron core, a transistor amplifier connected to said induction coil, said amplifier being controlled on the input side by the one half-waves of the control signals produced upon rotation of the magnet armature, and in which a controllable rectifier having a limiting resistor is connected to the outputs of the transistor amplifier, and an RC-member consisting of a capacitor and series connected resistor is connected to the junction point of the limiting resistor and rectifier, said controllable rectifier being switched through by a reference voltage member having a lower reference voltage than the operating voltage of the transistor amplifier and connected in parallel with said rectifier and with a control electrode, when the output voltage of the amplifier attains the reference voltage, in order to produce via the RC-member, for each of the one half-waves of the control signal, a control pulse for said ignition circuit which is connected to the RC-member, transistor amplifier comprising a n-p-n transistor in common-emitter circuit, the base of which is connected to one end of the induction coil by a resistor and a diode, the coil being wound in such manner as to produce half-waves with a negative amplitude upon a decaying magnetic field.

Claim 11

An electronic ignition device for an internal combustion engine having an ignition distributor and an ignition circuit electrically connected with the distributor arm of the ignition distributor on the output side, said ignition circuit being controlled without contacts by a magnetic pick-up having a rotatable armature and a stationary induction coil, wherein said armature of the magnetic pick-up comprises a disk of non-magnetic material mounted on said distributor arm for rotation therewith, a plurality of permanent magnets inserted in said disk, the number of magnets corresponding to the number of cylinders of the internal combustion engine, the magnets being uniformly spaced on the disk in circumferential direction and disposed at equal radial distances from the axis of rotation of said distributor arm, said magnets each having one of the pole faces exposed on the side of said disk remote of the distributor arm and situated in a plane at right angles to said axis of the distributor arm, and an induction coil having a soft iron core provided with an end face adjacent said side of the disk and arranged so that upon rotation of the disk said exposed pole faces move across said end face of the soft iron core, a transistor amplifier connected to said induction coil, said amplifier being controlled on the input side by the one half-waves of the control signals produced upon rotation of the magnet armature, and in which a controllable rectifier having a limiting resistor is connected to the outputs of the transistor amplifier, and an RC-member consisting of a capacitor and series connected resistor is connected to the junction point of the limiting resistor and rectifier, said controllable rectifier being switched through by a reference voltage member having a lower reference voltage than the operating voltage of the transistor amplifier and connected in parallel with said rectifier and with a control electrode, when the output voltage of the amplifier attains the reference voltage, in order to produce via the RC-member, for each of the one half-waves of the control signal, a control pulse for said ignition circuit which is connected to the RC-member, transistor amplifier comprising a n-p-n transistor in common-emitter circuit, the base of which is connected to one end of the induction coil by a resistor and a diode, the coil being wound in such manner as to produce half-waves with a negative amplitude upon a decaying magnetic field.

Claim 12

An ignition device according to claim 9, in which said controllable rectifier is formed as a miniature thyristor having an anode connected by a limiting resistor to the collector of the n-p-n transistor, and a catHode connected to the emitter of the transistor.

Claim 13

An ignition device according to claim 10, in which said reference voltage member comprises a Zener diode having an anode connected to the control electrode of said miniature thyristor and by a resistor to the emitter of the n-p-n transistor,

Claim 14

An ignition device according to claim 11 in which the Zener diode is connected in parallel to the anode-control electrode gap, the Zener voltage of said diode not exceeding 70 percent of the operating voltage of the transistor.

Claim 15

An ignition device according to claim 11, in which the collector of the n-p-n transistor is connected to an output terminal adapted for connection with an RPM counter by means of a matching circuit.